通过局部化学势对石墨烯等离子体低聚物的电磁行为进行动态调控。

Dynamic tailoring of electromagnetic behaviors of graphene plasmonic oligomers by local chemical potential.

机构信息

Fujian Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China.

出版信息

Phys Chem Chem Phys. 2018 Jun 20;20(24):16695-16703. doi: 10.1039/c8cp01281d.

DOI:10.1039/c8cp01281d

PMID:29877522

Abstract

In the mid-infrared and terahertz (THz) regime, graphene supports tunable surface plasmon resonance (SPR) by controlling the chemical potential, which promotes light-matter interaction at the selected wavelength, showing exceptional promise for optoelectronic applications. In this article, we show that the electromagnetic (EM) response of graphene oligomers can be substantially modified by the modification of the local chemical potential, strengthening or reducing the intrinsic plasmonic modes. The effect mechanism is corroborated by a graphene nanocluster composed of 13 nanodisks with D6h symmetry; by transforming to D3h symmetry, the effect mechanism was retained and more available plasmonic resonance modes appeared. The intriguing properties open a new way to design nanodevices made of graphene oligomers with highly efficient photoresponse enhancement and tunable spectral selectivity for highly accurate photodetection.

摘要

在中红外和太赫兹（THz）区域，通过控制化学势，石墨烯支持可调谐的表面等离激元共振（SPR），这促进了所选波长的光物质相互作用，在光电子应用中显示出巨大的前景。在本文中，我们表明，通过局部化学势的修饰，石墨烯低聚物的电磁（EM）响应可以得到显著的改变，增强或减少内在的等离子体模式。通过由 13 个具有 D6h 对称性的纳米盘组成的石墨烯纳米团簇证实了该作用机制；通过转化为 D3h 对称性，保留了该作用机制，并且出现了更多可用的等离子体共振模式。这些有趣的性质为设计由石墨烯低聚物组成的纳米器件开辟了一条新途径，这些纳米器件具有高效的光响应增强和可调谐的光谱选择性，可实现高精度的光电探测。